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2e8d39bed7
Summary: If some stack frames in a trace fail to symbolicate (or are genuinely unmapped), their `frame` field will be null, and `ExceptionsManager.js` will currently crash. This diff lets it recover gracefully and show whatever information is available. Reviewed By: dcaspi Differential Revision: D15296220 fbshipit-source-id: 2b1006b1354295171b25bfc6230c5b3e0c57f67f